I did direct push-push with no cables, video is using an almost dead 4.8 nicad, so it's slower than normal.
Mine twin bug's about as old school as it gets, one of Jack Tse's first planes. Roughly 30 year old plane, most of them sitting on a shelf, in Yellow's warehouse. Currently getting a full rebuild/update with a hopeful return to the skys this summer
I too am interested in a direct pull pull with no cables. I did a single link setup on a Y/A P-38 by putting a slight bend in one arm, and locating servo close to, and lower than steering arm. Lots of flights, steering is super tight, and never any issues
https://www.youtube.com/watch?v=_khIISQMmO0